Sheet-push-off mechanism



Mafch 24, 1931. c. F. FRAUENBERGER SHEET PUSH-OFF MECHANISM Filed Oct. 25, 1928 2 Sheets-Sheet l March 24, 1931. c. F. FRAUENBERG ER 1,797,414

I SHEET PUSH-OFF MECHANISM Filed Oct. 25, 1928 2 Sheets-Sheet 2 I mu .0 r \1. Nu 7w:ME= E: 5::5: wNLT (STATES a suitable gripping devices to seize the leading P tented Mar. 24, 1931 NArIoNALrREss o0. I1\TC.,'A CORPQR-ATION'OF DELAWARE SHEET-PUSH-OFF MECHANISM Application fi1ed'0ctober 25, 1928. Serial No. 314,879.

The object of this invention is to. provide improvements in sheet feeding mechanisms for use on: cutting, creasing and embossing;

presses .of the type handling relatively large and heavy sheets of cardboard and like ma? terial for the manufacture of boxes and receptacles.

Heretofore ithas been thepractice to separate the top sheet from the. pile by means of frictional devices which en "age the top sheet and slideit off or push it o the pile to enable edge of thesheet and convey it to the press.

' push it-oif the pile.

- I Fig. 2 is a similar view showing the mecha pushed, off the pile and with parts broken Ithas been found, however, that such frictional separating devices do not alwayswork satisfactorily; for several reasons, amongst which may be cited the natural adhesion between the sheets, surface conditions and the like, as Well as weight. Where, for instance,

heavy sheets of the kinds used for'making automobile'door: panels areto be separated automatically, it is desirable to provide more eflicient'separating means.

iItfhasbeen found entirely racticable to separate such andother sheets y means of apusheoffmechanism arranged to eifigage the frontedge of the sheet and push it 0 the pile in a direction towards the press. Themain object therefore, of this invention is to pro videasheet push off mechanism adapted tobe mounted on an automatic feeder forcut ting, creasing andembossing presses, and arranged to engage the edge of the sheetand v Accordingl th invention is embodied in a sheet push ofi mechanism arranged and constructed as hereinafter set forth and as illustrated in the which r Fig. 4 is a sectional ,view on line H of F g r I i accompanying drawings in igil is a side view of alsheetpush offmechanism embodying the. invention with parts in sectionand showing the mechanism;

Figurel. 7. Fig. 6 is a sectional'view online 66 of Figure 1 .x F p i I ig. :7 is a detail view of the sheet engaging member.

V rrm umviannennsor FRANKLIN, MASSACHUSETTS, assreivort'iro THOMSON Fig. "5 is a seetionalviewline 5- -5 of.

The inventionis more particularly directed I towards improvements in 7 sheet feeding mechanisms of the t pe disclosed in the appli i cation forgpatent led November 16, 1927, Serial Number 233,643. With respect to the supporting means for the device reference is therefore made to the said application.

Referring to the drawingsthe reference i numeral 8 denotes the pile of sheets whichis usually supported on a pile elevator, indicated at 9, so that as the top sheet is' removed the pile is elevated to maintain the desired level in an obvious and well understood manner in theart. The sheet feedingdeviee further includes certain'fixed supporting meni-j bers which are "located above the pile of'the sheet transversely. thereof. Some 'of said 1 members are used forthe. supportof the here in disclosed push-ofilmechanism.- Thusfthe cross bars and 12 a fixed shaft whichare part I i reference numerals 11, 11 denote two fixed of the device to which the push-off mechanism'is attached... 21 isa rotatable shaft, also a part of the feeding mechanism. 1 To the cross bars 11,11 is secured'a bracket 17 one end of which is cut out tofor'mtwo wings'18, .18, through which the said shaft 21 passes. To the bracket 17 are secured two bars 15 formed withlongitudinal'guiding slots 16extending from the cross bars" 11 below the i hanger 13 and forming fixed supportingelements forthe push-01fmechanism.

f ThenumeralflQ denotes'a pinion keyed to the shaft 21' between the wings 18 as seen. in Figure 5. 22isa rack which is supported in two placeson rack bars 23l 23.-Fig. 5, fastened to the underside of the wings18'and on rack bars 14 securedtoa hanger 13 fixed on the shaft 12.: The'rack is adapted to slide on the rack bars in'engagementjwith the pinion 19. The rack is toothed fora suitable distance equal to the length of its stroke.

The rack carries a sheet engaging mechanism'as follows, see Figure 4. Thenumeral The numeral 35 denotes a sheet engaging is mounted guide rolls 31, 31 which slide inthe slots 28, and cam rolls 32, 32 outside the husiiig' 2'5. T6 the bottom or the piungsr 29 there is pinned a mask 33. Springs 34, 34 act between the housing and the block 33 to normally force the plunger downward.

member which is screwed fast to the block 33 and'provided with inclined sheet enga ging surface 36. The arrangement is such that on the feeding snake of rack, to the left in Figure l, the member 35 engages the frontedge of the top sheet 36 and pushes it off the pile a short distance. Thereafter the sheet engaging Ineniber is disengaged from the sheet by a tripping mechanism.

' The latter inecl-iaiiisni, Figure 5', comprises a housing consisting of wayside pieces 40, 40 joined bye transverse girder 4-1. The lions ing is adj-iistably ssciiredtd the aforesaid guide bars 15' by bolts 42 having heads 43- vvitl iifi the wa s or slots 16. To each of the housing side pieces lflthe're is fastened a fixed trippei' ca i'n ehaving an inclined canisur face 5, The pisses are further pro-vided with slots 46, re, throifgh which extend studs 4'? which carry movable illlpp'el' cams 48, 48, one adjacent ealdh sidepiece 40. There are thus two cams on sschsidsof the housing so -4i, fixed can: ands movable cam. The movable Cain is held in engagement with the fixed cam by'a' spring" 49',- the movable having an ineiined forward cam si i isss clo-operatingwith th and surface- 45 on dis fixed cain. In addition, each msvahle'ca m is suspended in the shit 46- by means oi a sp ing; 51. The movable cant is also provided with a directing enses 5s.

In describing the operation it should be undsrstdodnist th shaft 21 is oscillated in chfonisni with the press. Fnrther', that in speaking of the device as ashee't push-ofli' niechanisni, it is to be understood that the sheet is pushed off the pile only a short dis-. fence to enable other sheet handling means, not shown, to engage and manipulate the sheet in the further well known operations of ripping it and conveying it to the press.

Siich nieans are, however, wellknown in the art and need not be described herein.

In operation, the sheets are placed on the nest ed e of the sheet.

pinion 19 is moved clockwise and causes the rack to be moved towards the pressfrom right 7 to left in Figure 1; Consequently, the member 35 engages the edge of the top sheet and pushes it off the pile, that is to say, the top. sheet. is piishsd distance siifiic'ifit to rate the sheet and permit fn'r'ther manipulation by other sheet handling devices such as grippers.

, At the end of the push off stroke, not the feeding stroke ofthe rack, the rollers 32 on the plnnger 29 engage the fixe'dtripgier cam is? and iULii Oil the inclined surface 45' there'of'wher'eby the plun er 29 winber'sissd the sheet engaging member 35 lifted from the sheet and thepiish ofimqve= nient ceases. The parts are sd adjusted that the rollers 32 run in on the cam 4e and c'ei'n'e to rest thereon at the end of the feeding stinks of the rack. Duii'ngthi-s; movementthe roll ers 32'--i-uii under and lift the movable trip Cains 48, which, however, immediately pulled down again by the s rings 49.

On the return stroke, the rack nioves ferward from left to right; in Figure 1 and the rollers 32 now'run iip'on'the movable trip cams 48 and off those earns back into starting position readyto push off the sheet. In other words, the sheet engaging" member has a c cle of movement including the pdsh-efi stroke, then a lifting movement caused by the ,fixsd trip sr cans, then a return msvsmeiit iii atoc'high position andteiid to abut the inovabletripper c'sm instead of the fixed (ins; they-will cause the movable cams tobe lifted and run under the directing surfaces 53 and then Olitg'i the 'fiXeCl cams. Hence the I'QSOfi for enabling the movable flipper-cam te be lifted at either end." a r 7 It will be noted that the device permits ridjiistment biitli with regards fid'fih' size (If the sheet as well as regardingthe' movement nee-'- essary to push the sheet on the pile. Fer diffeiilt thicknesses (if Sl'ii'l; 5i difi fiit sheet engaging member may be used. Also,- that aside sheets are meted upwards, the level of the sheet engaging member is ad= jdstsd automatically.

The device as herein described is simple COhStfl'ItiO'Tl, easiyof operation and adjustment and is readily adaptable for installation and use with existing types sfsii'tom'sds sheet feeding devises. v

l. A member adapted to engage the edgebf thetop sheet of a pile drsneets, means ior assisting saidnieinbefto enga e the edge of said sheet and move it a distance on'the ios iis

pile of sheets and means for automatically disengaging said member from the sheet.

2. The combination of supporting means, a

sheet engaging member slidably mounted thereon, means for operating said member a given d1stance, means for causing sald member to engage the edge of the top sheet of a pile of sheets during a part of said movement to move said sheet along on the pile of sheets and means for automatically disengaging said member from the sheet."

3. The combination of supporting, means, a sheet engaging member slidably mounted thereon, means for operating said member a given distance on said supporting means,

means for causing said member to engage the edge of the top sheet of a pile-of sheets to move said sheet and adjustably mounted 7 relation with a sheet to be moved, means for operating'said slidable member to cause said sheet engaging device to engage theedge of the sheet and move the same and means carried by said supporting means for automatically interrupting the movement of the sheet engaging device to disengage it from the sheet. w

5. y In a device of the character described a sheet moving'meinber having means for engaging the edge of a sheet and the surface of the sheet adjacentsaid edge, means for oper- Y ating said sheet moving member to move the sheet, mechanism for automatically disengaging said member from contact with the sheet and means for operating said member back to I starting position.

'6. In a device of the character described a sheet moving member having means for engaging the edge of a sheet and the surface of the sheet adjacent said edge, means for operating said sheet moving member to move the sheet, mechanism for automatically disengag ingsaid member from contact with the sheet and means for operating said member back to'starting position, said automatic mechanism comprising means for interrupting the movement of the sheet engaging member and direct it'into a different path and othermeans for directing the return movement of said sheet engaging member to starting position.

'7. Ina device of the character described,

direction to cause said 7 sheet moving member tomove the sheet, automatic means for moving saidsheet moving member into a different pathduring said movement whereby to disengage it from' the sheet, means foroperating said rackin the opposite direction to return the sheet moving'member to starting position and means for directing said return move-, ment into a path diiferent from the sheet mov- 7.

ing movement.

e CARL F. FRAUENBERGER.

the combination of supporting means, a rack V slidably supported thereon, a sheet moving member for engaging the edge and surface of a sheet to be moved adjustably secured to said rack, means for operating said rack in one 

